Construction stalled on 'world's tallest building', so locals made its foundation into a fish farm

work stalled after concerns from regulators over the safety of the skyscraper and its environmental impact and funding.

With no progress on the project in sight, villagers nearby have started to raise fish in its 2.6-hectare water-filled foundations [...]

One villager started to raise fish in March and has invested over 20,000 yuan in his business. “I raise fish on the construction site. It is not in secret, neither have I ever been stopped”
— scmp.com

Construction on the would-be world's tallest building, known as Sky City in Changsha, China, began in 2013, under leadership of Broad Sustainable Building. Sky City made headlines not only for its proposed record-breaking height, but for the speed at which it was to be completed – Broad Sustainable Building promised that using a signature method of pre-fabrication techniques, Sky City would be built in just nine months. Now way past that due date, Sky City's vacant foundations have been repurposed by local villagers as a fish farm.